Jerry: the information on the hydraulic fluid should be covered in the 840 Articulated Loader Operators Manual Form SV-112B - Part No 1012879-1. Unfortunately, I don't have that in doc. in my periodical library.
If the fluid is not the problem, it might be good to start with a clutch pressure check or could be also worn splines on the Torque Converter Pump drive, flex drive plate failure or low clutch pressure which would occur as a result of a weak regulator valve spring or regulator spool sticking. The later could be remedied through removal and cleaning possibly.
The Service Manual for the AC 840 wheel loader is form No. ISM-17 and part number 1013042-5.
Orangeman
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